Four-cycle engine and motorcycle comprising four-cycle engine

Details Four-cycle engine and motorcycle comprising four-cycle engine Four-cycle engine and motorcycle comprising four-cycle engine

2008-07-08

2008-07-08

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S192200

Reexamination Certificate

active

07395800

ABSTRACT:
A four-cycle engine of the present invention comprises a gas exhaust outlet that is formed on an upper region of a crankcase to exhaust a gas from the interior of the crankcase to outside; and a rotatable shaft disposed in close proximity to the gas exhaust outlet in the interior of the crankcase. The gas exhaust outlet is configured to open toward a region in the interior of the crankcase, the region extending from a line segment connecting the gas exhaust outlet to a rotational center axis of the shaft, in a rotational direction of the shaft at a cross point where the line segment crosses an outer peripheral surface of the shaft.

REFERENCES:
patent: 4541399 (1985-09-01), Tanaka et al.
patent: 4656991 (1987-04-01), Fukuo et al.
patent: 4696267 (1987-09-01), Kohno et al.
patent: 4790287 (1988-12-01), Sakurai et al.
patent: 6425451 (2002-07-01), Yoshida et al.
patent: 57-193708 (1982-11-01), None

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